The renormalization group (RG) method formulated first by Wilson [1]}-[2]} is a nonperturbative method which allows to interpolate smoothly between the UV laws and the IR phenomena in physical systems. The RG has a vast range of applications. A particularization of the RG, the functional renormalization group (FRG) is a realization of the RG concept in the framework of quantum and/or statistical field theory and is one of the best candidates for studying quantum fluctuations [3]}. An important property of this method is that the FRG could be used in regimes where perturbative calculations are invalid,
for instance, at the vicinity of nontrivial fixed points in the infrared regime.
